Chair seat frame



FIG. 1 is a perspective view of chair seat frame showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left end view thereof.

FIG. 5 is a right end view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The ornamental design for a chair seat frame, as shown and described.